Table 1. Chemical properties of soil and wheat straw at early and late stages of decomposition at different temperatures.
| Parameter | L30 | M30 | H30 | L120 | M120 | H120 |
|---|---|---|---|---|---|---|
| pH | 7.42 ± 0.02a | 7.38 ± 0.01ab | 7.27 ± 0.01bc | 7.47 ± 0.02a | 7.36 ± 0.05ab | 7.24 ± 0.01c |
| C/N ratio | 20.03 ± 0.53a | 19.44 ± 0.45a | 19.43 ± 0.58a | 18.12 ± 0.12a | 18.11 ± 0.60a | 17.41 ± 0.87a |
| DOC (mg kg–1) | 125.44 ± 1.92a | 126.19 ± 9.40a | 130.40 ± 4.04a | 118.85 ± 2.76a | 117.62 ± 2.87a | 134.73 ± 4.71a |
| DON (mg kg–1) | 81.57 ± 3.09d | 99.95 ± 2.83d | 148.96 ± 1.74c | 70.05 ± 4.86d | 185.12 ± 6.58b | 234.85 ± 12.77a |
| MBC (mg kg–1) | 295.15 ± 10.01b | 292.53 ± 2.46b | 174.51 ± 15.91c | 362.98 ± 9.34a | 338.69 ± 17.35ab | 169.14 ± 9.29c |
| MBN (mg kg–1) | 21.08 ± 4.11c | 35.52 ± 2.70abc | 46.19 ± 3.09ab | 34.36 ± 5.54bc | 52.61 ± 4.31a | 39.55 ± 1.19ab |
| Straw C (g kg–1) | 414.85 ± 12.31bc | 434.30 ± 5.19b | 418.14 ± 18.31b | 490.63 ± 6.39a | 342.40 ± 11.91d | 361.68 ± 8.56cd |
| Straw N (g kg–1) | 3.93 ± 0.10b | 5.06 ± 0.63b | 8.14 ± 0.37a | 4.45 ± 0.05b | 4.85 ± 0.07b | 6.76 ± 0.07a |
| Straw P (g kg–1) | 0.53 ± 0.01e | 0.58 ± 0.03e | 0.90 ± 0.05d | 1.11 ± 0.05c | 1.45 ± 0.01b | 2.02 ± 0.02a |
L30: low temperature (15 °C) on day 30 (early stage of decomposition); M30: moderate temperature (25 °C) on day 30; H30: high temperature (35 °C) on day 30; L120: low temperature on day 120 (late stage of decomposition); M120: moderate temperature on day 120; H120: high temperature on day 120.
C/N ratio: soil carbon/nitrogen ratio, DOC: soil dissolved organic carbon, DON: soil dissolved organic nitrogen, MBC: soil microbial biomass carbon, MBN: soil microbial biomass nitrogen.
The values are average values ± standard error (n = 3). Different letters within a row indicate a significant difference (P < 0.05) between treatments according to Tukey’s test.